Alert archive / California / Flash Flood Warnings in 2021
Flash Flood Warning 106, NWS Las Vegas, NV
NWS Las Vegas, NV issued this flash flood warning at Aug 10, 2021, 6:55 PM PDT for San Bernardino County, California. It was in force for 3 hr. No storm report in the archive falls inside the area while it was in force.
The area
The outline as issued.
The facts
- Issued
- Aug 10, 2021, 6:55 PM PDT (01:55 UTC)
- Expired
- Aug 10, 2021, 10:00 PM PDT
- In force
- 3 hr
- Issued by
- NWS Las Vegas, NV
- Area
- Storm-based polygon
- Damage threat
- Considerable
- Flood severity
- None
County San Bernardino County, CA
The radar
The Las Vegas radar (KESX), 135 km from the middle of the area, began a volume at 01:55 UTC, the scan nearest the moment this went out.
Open the radar archive at this moment
The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.
The nearest sounding before it
Las Vegas, NV (KVEF), launched 00:00Z, 1.9 hours before the alert went out and 225 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.
- Mixed-layer CAPE
- 656 J/kg
- Mixed-layer CIN
- -12 J/kg
- Mixed-layer LCL
- 3298 m above ground
- 0-6 km bulk shear
- 11 kt
- 0-1 km storm-relative helicity
- 41 m²/s²
- 0-3 km storm-relative helicity
- 92 m²/s²
- Significant tornado parameter
- 0.0
- Supercell composite
- 0.0
The text
As transmitted.
230
WGUS55 KVEF 110155
FFWVEF
CAC071-110500-
/O.NEW.KVEF.FF.W.0106.210811T0155Z-210811T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
BULLETIN - EAS ACTIVATION REQUESTED
Flash Flood Warning
National Weather Service Las Vegas NV
655 PM PDT Tue Aug 10 2021
The National Weather Service in Las Vegas has issued a
* Flash Flood Warning for...
San Bernardino County in southern California...
* Until 1000 PM PDT.
* At 655 PM PDT, Doppler radar indicated thunderstorms producing
heavy rain in Highway 95 from Needles south to Vidal Junction.
Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms
producing flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water
crossings, creeks, normally dry washes and roads.
* Some locations that will experience flash flooding include...
Highway 95 between Needles and Vidal Junction.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3482 11459 3478 11458 3464 11447 3432 11437
3408 11445 3409 11466 3424 11478 3483 11470
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
SC2 follow-up statements
392
WGUS75 KVEF 110329
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
829 PM PDT Tue Aug 10 2021
CAC071-110500-
/O.CON.KVEF.FF.W.0106.000000T0000Z-210811T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
829 PM PDT Tue Aug 10 2021
...FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 10 PM PDT THIS
EVENING FOR SAN BERNARDINO COUNTY...
At 829 PM PDT, Doppler radar continued to indicate thunderstorms
producing heavy rain in Highway 95 from Needles south to Vidal
Junction. Flash flooding is ongoing or expected to begin shortly.
HAZARD...Life-threatening flash flooding. Thunderstorms producing
flash flooding.
SOURCE...Radar.
IMPACT...Life-threatening flash flooding of low-water crossings,
creeks, normally dry washes and roads.
Some locations that will experience flash flooding include...
Highway 95 At Mile Marker 29, Needles and Vidal Junction.
PRECAUTIONARY/PREPAREDNESS ACTIONS...
Turn around, don't drown when encountering flooded roads. Most flood
deaths occur in vehicles.
&&
LAT...LON 3482 11459 3478 11458 3464 11447 3432 11437
3408 11445 3409 11466 3424 11478 3483 11470
FLASH FLOOD...RADAR INDICATED
FLASH FLOOD DAMAGE THREAT...CONSIDERABLE
$$
CO789
WGUS75 KVEF 110458
FFSVEF
Flash Flood Statement
National Weather Service Las Vegas NV
958 PM PDT Tue Aug 10 2021
CAC071-110508-
/O.EXP.KVEF.FF.W.0106.000000T0000Z-210811T0500Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
San Bernardino CA-
958 PM PDT Tue Aug 10 2021
...FLASH FLOOD WARNING WILL EXPIRE AT 10 PM PDT THIS EVENING FOR SAN
BERNARDINO COUNTY...
Flood waters have receded. Flooding is no longer expected to pose a
threat. Please continue to heed remaining road closures.
LAT...LON 3482 11459 3478 11458 3464 11447 3432 11437
3408 11445 3409 11466 3424 11478 3483 11470
$$
COThe office that day
Everything else NWS Las Vegas, NV issued on the same UTC day.
| Issued | Product | Office | Counties | Lasted |
|---|---|---|---|---|
| Aug 10, 5:13 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 92 min |
| Aug 10, 5:49 PM PDT | Dust Storm Warning | VEF | San Bernardino | 56 min |
| Aug 10, 6:43 PM PDT | Severe Thunderstorm Warning | VEF | San Bernardino | 47 min |
| Aug 10, 11:22 PM PDT | Flash Flood Warning | VEF | San Bernardino | 3 hr |
Nearby
Flash Flood Warnings in California, 2021Every flash flood warning in 2021
Sources
The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.